Great suggestions so far - thanks.
Here's my first course materials... based on Fired@51's suggestion. 
It's also configurable, so I can ask the question, "How many of you would like to be millionaires?" And then show them that if they invest $4,000 each year into a Roth IRA, they would have over $1M tax free.
Granted, there should ideally be all ages of people in this class so the Age 25 thing is more for illustration than parallel example (at least until I'm able to teach at the College level... right now I'm figuring to start with community programs).
You'll have to rename the attachment from .txt to .xls since .xls isn't allowed. 
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